Shoe fob blowtorch scarfing head



Jan. 10, 1950 L. N. HERRING 2,493,820

SHOE FOR BLOWTORCH SCARFING HEAD Filed July 15, 1946 v INVENTOR [554 /5 /V fif/m/A/a ATTORNEY Patented Jan. 10, 1950 UNITED PATENT OFFICE SHOE FOR'BLOWTORCH SGARFING HEAD Leslie N. Herring, Hammond, Ind.

Application July 15, 194.6 Serial No. 683,751

5. Claims. (Cl. H -27.4)

This invention relates to apparatus used for surface treatment of ferrous metal billets and similar objects with the aid of jets of oxygen or other suitable desurfacing gas, and is particularly directed to improvements in mechanism associated with the nozzles through which the gas is ejected for impingement against the object being treated.

An example of apparatus heretofore proposed for carrying out these treatments appears 'in U. S. Patent 2,210,921, issued August 13, 1940, to Homer W. Jones et al., said apparatus comprising four scarfing shoes engageable with the surface being treated, each supporting a plurality of gas nozzles positioned to direct a plurality of gas jets angularly toward the proximate face of a billet of substantially rectangular cross section as it moves longitudinally past the heads.

The treatment'is usually carried out while the billets are at high temperatures such as atred heat and their surfaces often carry slag deposits or projections termed scabs, while the treatment itself generates intense heat and formation of additional slag. It results that in the desurfacing apparatus heretofore in use the slag tends to adhere to the heated shoes and nozzle tips and does not subsequently crack off when the parts are permitted to cool; moreover, the heat softens the metal of which they are made and so renders it readily susceptible of being gouged and deformed by large scabs or other projections on the billet surface. In consequence it is often a matter of but a few hours before the shoes and sometimes the nozzles must be replaced.

My invention is directed to prolonging the useful life ofthe head and nozzle components, particularly the shoesthrough which the nozzles extend and the nozzle tips themselves, through the provision of means whereby excessive heating of these parts and adherence of hot slag thereto and their gouging or premature erosion and deterioration under the combined effects of high temperature and mechanical abrasion is reduced to a minimum.

It is therefore a principal object of the invention to provide a scarfing head shoe of novel construction comprising a replaceable water cooled face plate which is effective not only to minimize adherence of slag, particularly in the vicinity of the nozzle tips, but to prevent mechanical gouging or abrasion of the tips and face of the shoe body by contact with scabs and like irregularities on the billet surface, whereby the useful service life of the shoe is materially prolonged over that of the shoes hitherto utilized for the same character of work.

Another object is to provide a scarflng head shoe including a removable face platein which a, passage is provided to receive water or other coolant from the interior of the shoe and theme discharge it at the edges of the face plate and adjacent the nozzle tips where its presence; tends to prevent adherence to the parts of slag car: ried by the billets or generated by the action of the desurfacing gas.

Other objects, purposes and advantages ofithe invention will hereinafter more fully appear or be understood from the following description of a preferred embodiment of it shown in the .a.c eompanying drawing, in which:

Fig. 1 is a fragmentary transverse staggered section on line I.l in Fig. 2 of one .of my imaprovedshoes in inverted position as;when scarfl-ng the under surface of a, billet indicated by the broken line B;

Fig. 2 is a view thereof'in elevation looking from the left of Fig. 1;

Fig. 3 is a rear elevation of the face plate re: moved from the shoe, and

Fig. 4 is an end view of the face plate.

In the several figures like characters are used to designate the same parts, the arrows on the section line lfil in Fig. 2'indicating the direction of view in Fig. 1. Y

Referring .now more particularly to the draw-. ing, it will be understood the scarfing head H, fragmentarily indicated in Fig. 1, maybe of any suitable or desired construction as it forms no part of the invention, serving primarily to support the water cooled shoe thereof, generally designated S, and the nozzles N, of which agreat, er or fewer number than indicated in the drawing may be employed. The body I of the shoe is removably secured to'the head by cap screws X and studs Y suitably positioned to hold it firmly thereto, and through a boss 2 in its center is extended an inlet 2 for water orothercoolant, generally under about 50 lbs. per sq. in. pressure, which circulate through a chamber 3 formed by a recess-in the shoe closed by the adjacent face of the head. A primary outlet 4, of which more than one may be provided, permits escape of the principal proportion of the water, which in its passage through the chamber bathes and thereby cools the bodies of nozzles LN, the holes 5 in the front face 6 of the shoe through which the nozzles project being provided with packing glands l to seal them against water leakage.

That face of the shoe which is designed to -con-v tact the billet carries awear-in strip W of hard material such as Stellite in accordance with usual practice, while the front face 6 of the body supports a removable plate 8 desirably formed of copper or other highly heat conductive metal.

This plate extends across the entire width of the front face, is provided with ports 9 for the-burner tips, and'is removably secured to the body by cap screws ll] threaded into the latter. Across the plate in the face ll thereof lying against the body face 6 I provide a groove or chamber with their tips projecting through one wall thereof and outwardly from said outer face of the body, a heat conductive plate having a plu- The body andplate are thus in complemental relationship, in interfacial contact and minutely spaced'from each other in random areas to provide communicating passages between them.

Thus during normal operation, when water under pressure is supplied to chamber 3, asmall the lateral edges of the plate and registering with portion of it flows through hole [3 into channel 12 and laterally outward to its ends where it escap'es to seep ontothe adjacent outer surfaces of the plate and body, while some of it also tends to seep into ports 9 through the unpacked joint between the juxtaposed body and face plate surfaces. The portion of the water supplied to chamber 3 which passes through hole l3 thus serves a double purpose, effectively cooling plate 8 and adjacent nozzle tips by conduction during passage through channel l2 and also wetting the surfaces of the nozzles and the plate after its escape from the channel, thereby inhibiting adherence of slag formed by the action on the billet of the gas ejected from the nozzles or which may have been previously adherent to the billet. Slag from either source tends when brought into 0011- tact with hot metal to adhere tightly thereto and to other slag bodies but does not adhere so readily to, or cracks off easily from, relatively cold metal especially when the metal surface is moist, and by providing in accordance with the invention a shoe of which the surfaces, as well as those of the nozzle tips, exposed for'contact by slag are kept both relatively cool and .moist, I not only prevent the deterioration resulting from slag adherence but also prevent the metal of the shoe from softening in the intense heat and so becoming susceptible to gouging or deformation through contact with projections on the billet, thereby greatly reducing the servicing requirements of the scarfing head as a whole. Thus as a result of my invention I am able to keep scarfing head shoes and nozzles in service for several months whereas hitherto renewal, at least rality of ports the walls of which respectively surround the nozzle tips in spaced relation thereto, and. means for removably and complementarily securing the plate against said face of the body in interfacial contact with and minutely spaced therefrom in random areas to provide communicating passages therebetween, said plate having a groove extending in substantial alignment with but spaced from the ports, opening at said secondary outlet, the groove forming with said "face a passage for water flowing from the chamber through the secondary outlet and thence into the groove whereby when water is introduced under pressure to the chamber'through the inlet a portion is evacuated through-the primary out- I sages between said face and said plate.

2. In scarfing apparatus, a shoe having a body having a substantially flat outer face and providing a chamber, an inlet passage extending through a wall of the body into the chamber, a

r plurality of nozzles spanning the chamber and projecting beyond an outer face of the body, a plate removably secured against said face having ports receiving the projecting portions of the nozzles and a groove proximate said face opening at the lateral edges of the plate, the body also providing an outlet passage from the chamber through a wall thereof and in registery with said groove,- and means for securing the plate against said face of the body in complemental relation and interfacial contact therewith and minutely evacuated through said outlet passage and in part in part, was normally required after only'a few tion, arrangement and relationship of the several parts of the latter will readily occur to those skilled in the art and may be made is desired, without departing from the spirit andscope of the invention as defined in the appended claims. Having thus described my invention, I claim and desire to protect by Letters Patent of the United States: a r

1. A scarfing shoe comprising a body having at least one substantially flat outer face and providing a chamber and passages through its walls respectively forming a water inlet into, and primary and secondary outlets from, the chamber, a plurality of gas nozzles extending through the seeps between the plate and the said outer face of the body through said communicating passages and in part is dischargedat the ends of the groove, said body also having another passage opening outwardly from the chamber for evacuating other of said water therefrom.

3. A shoe for a scarfing machine having a body providing a chamber and inlet and outlet passages for circulation of fluid under pressure therethrough andhaving at least one substantially flat outer wall, a plurality of nozzles extending through the chamber and terminating outwardly of said wall, a face plate removably and complementarily secured to the outer face of said wall in interfacial contact therewith and minutely spaced therefrom in random areas to provide communicating passages therebetween, said plate having a plurality of ports the walls of which respectively surround the nozzles in spaced relation thereto and a groove adjacent the ports forming with said chamber wall a water-conducting passage open at its outer extremities and communicating with said ports between the plate and said chamber wall, the latter having a port interconnecting the chamber with the passage.

. 4. A face plate for a scarfing shoe, formed of heat conductive material and having a plurality of transversely aligned spacednozzle-tip-receiving ports and a groove extending transversely of the plate adjacent said ports and terminating at the lateral edges of the plate, said plate being adapted to cooperate with a surface of a scarfln shoe against which the plate is to be positioned whereby the groove and shoe form a passage for fluid, said plate also having holes for receiving means for securing it to the body of the shoe.

5. A face plate for a scarfing shoe, formed of heat conductive material and having a plurality of transversely aligned spaced nozzle-tip-receiving ports and a groove extending transversely of the plate adjacent said ports and terminating at the lateral edges of the plate, said plate being adapted to cooperate with a surface of a scarfing REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,178,451 Jones Oct. 31, 1939 2,362,536 Buckman Nov. 14, 1944 

